Schweitzer Engineering Laboratories SEL-421-4 - Table B.1 Relay Word Bit Differences

Date Code 20171021 Instruction Manual SEL-421 Relay
SEL-421 RelayInstruction Manual
APPENDIX B
Converting Settings From
SEL-421-0, -1, -2, -3 to SEL-421-4, -5
Because of hardware changes and feature enhancements between the SEL-421-0,
-1, -2, -3 and the SEL-421-4, -5, the handling of a number of settings has
changed. In particular, the replacement of the SEL-2702 Ethernet Processor with
integrated Ethernet has significantly changed the handling of Ethernet related set-
tings. This appendix describes the key differences to aid users who need to con-
vert their settings from an SEL-421-0, -1, -2, -3 to an SEL-421-4, -5.
Relay Word Bit Changes
Relay Word bits are used in SELOGIC control equations and many other settings.
The SEL-421-4, -5 relays offer the following protection functions in addition to
the proven protection elements of the SEL-421-2, -3 relays.
SEL-421-4:
➤ Zero-setting out-of-step (power swing) element
➤ Standard phase-quadrilateral distance elements
SEL-421-5:
➤ Zero-setting out-of-step (power swing) element
➤ High-speed and standard phase-quadrilateral distance elements
Table B.1 Relay Word Bit Differences
SEL-421-2, -3 SEL-421-4, -5
Z1P (setting) Z1MP
Z2P (setting) Z2MP
Z3P (setting) Z3MP
Z4P (setting) Z4MP
Z5P (setting) Z5MP
E21P E21MP
E21XP (new setting)
TANG TANGG
TANGP (new setting)
TESTDNP TESTDB2
CCIN001–CCIN128 VB001–VB128
CCOUT01–CCOUT32 Removed—use any visible Relay Word bit